Transmission for elevator-car motors.



A. G. BJORKSTRZIM.

TRANSMISSION FOR ELEVATOR GAR MOTORS.

APPLICATION FILED 00'1.15, 1912.

1 1 1 3,744. Patented Oct. 13, 1914.

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W1 TNESSES THE NORRIS PETERS CO.. FHOTO-LITHOAI WASHINGTON. D C.

A. G. BJORKSTR'GM. TRANSMISSION FOR ELEVATOR GAR MOTORS. APPLICATION FILED OUT. 15, 1912.

. 1, 1 1 3,744. Patentd Oct. 13, 1914.

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WITNESSES INKENTOR my HIE NORRIS PETERS CO. FnUIU-LITHO.. WASHINGTON. D. c.

ANDREW e. nionxsrnoivi, or BnooknYN, new YORK.

TRANSMISSION non nnnvnron-onn Morons Specification of Letters Patent.

Application filed October 15 1912. Serial No. 725,870.

To all whom it may concern:

Be it known that I, ANDREW G. BJonK- more, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented new and useful Improvements in Transmission for Elevator-Car Motors, of which the following is a specification.

My present invention relates to transmis-. sion for elevator car motors of the class using gearing instead of cables for raising or lowering the elevator cars.

The principal object of my invention is to provide mechanism of the character described which will enablethe car to be at all times controlled in its ascent and descent in the elevator shaft, and avoiding the use of elements, such as cables, which are liable to rupture. and free the car to drop by gravity in its shaft. 1

Further objects of my invention are to .so dispose elements of the mechanism that they will be properly lubricated forsuccessful operation; that they will permit of use of a plurality of elements,-the product of the same mold-and thus reduce the cost of manufacture to a minimum; and, ingeneral, to provide mechanism. which is simple in construction and efficient in action consistent with other objects in view.

In the drawings, forming a part of this specification:-Figure lis a view partly in elevation and partly in section through a portion of the transmission .mechanism embodying my invention. Fig.2 is a bottom plan view of the mechanism disclosed in Fig. 1. Fig. 3 is a view in central vertical section through mechanism complementing that disclosed in Fig. 1 of the drawing. [Fig 4 is a sectional view on the line 44: of Fig. 3.

In the drawings, where similar charac: ters refer to similar parts, 5 designates complementary racks disposed in parallelism vertically of the elevator shaftiand with their threaded portions facing each other. These racks are complementary in that the threads 6 thereof extend in the sameidirection transversely of the longitudinal axis of the members and hence, may becast from the same mold or milled from the same machine without a change in the thread direction. The threads are concave and preferably substantially semi-circular in shape.

Adapted to besecured to the elevatorcar, as by bolting to the floor 7, thereof, are

complementary brackets or casings designated generally by 8,--one disposed adjacent each rack5 andalined with respect to each other, ashereinafter set forth. For purposes to be subsequently set forth, these brackets or casings are preferably built up of a plurality of parts, one purpose being to facilitate assemblage. Each bracket or casing may. include a body portion 9 having an upper and lower flange 10 and 11, respectively, the former being adapted to be secured to the floor 7, subjacent thereto, in any suitable manner. As clearly shown in Figs. 3 and 4: of the drawing, this body portion forms a chamber about a worm 12 adapted to rotate within said body portion and co-meshingwiththe teeth 6 of rack 5. To facilitate the insertion of lubricant into said chamber I provide a flap 13covering an enlargement 14 of the casing, and by this constructionthe required lubrication of several parts of the mechanism may be pro- ".vided for. Thebody portion 9 has a bearing-15 for the upper end of a vertical shaft 16, to which said worm 12 is keyed or otherwise secured to be rotatable therewith.

The body-portion 9 ispreferably semi circular in cross section, asclearly shown in Fig. 4 of the drawing and has guards 17 which are disposed laterally of rack 5 to confine the lubricant within the casing. Below the body portion 9 I providea second body 'portion' 18 forming a part of the bracket or casing 8, the body portion 18.

having. upper and lower flanges 19 and 20, respectively, the former coacting with flange 11 of body portion 9to permit of rigidly securing the two together. Disposed. below the body portion 18 is a head 21, having a flange 22 for coac tion with flange 20, to facilitate the holding of said head in place. This head in combination with body portion 18 forms a chamber about the lo wer portion of shaft 16, and the former carries a stepbearing 23 it therefor, while the latter has a bearing 24: for said shaftintermediate bearingsl15. and 23. The body portion 18is provided with a second bearing 25 disposed with its axis at a right angle tot-he axis common to bearings 15, 23 and 2 1.

An electric motor 26, of anysuitable type maybe provided as means for propelling the car and thismotor drives a countershaft 27 received by the bearings 25 of the Patented oasis, 1914.

two brackets or casings 8, said members bemg secured to the elevator car with sald' bearmgs in axial alinement. Wlthin the chamber of each bracket or casing 9 formed by body portion 18 thereof, I mount a bevel gear 28 rigid with shaft 27, each bevel gear 28 to co-meshfwith a second bevelgear 2-9 in said chamber and rigid with shaft 16, to turn both shafts 16 simultaneously in the same direction by rotation of shaft 27. By this construction, both Worms 12 of the mechanism may be threaded in the same direction, or in other words, the twoworms may be formed complementary, as are the racks 5, and likewise, the casings or brackets 9 and the gears 28 and 29 may be formed complementary so that the cost of manufacture ofthe machine is reduced to a minimum. The only difference in the mechanism may be in the disposition of the gears 29 Which are so positioned on shafts 16 and comeshing with gears'28 as'to provide for rotation of said shafts simultaneously in the same direction. 1

The operation of the mechanism is as follows: Assuming that the shaft 27 rotates in the direction indicated by an arrow, the shafts 16 will-have imparted thereto rotation in the same direction as indicated by arrows, and the worms 12 co-meshing with racks 5- will raise the car in its shaft. Rotation of shaft 27 in a counter direction will lower the car. I

Changes may be made in details without departing from the spirit or scope of my invention; but,

I claim 4 1. In transmission mechanism for elevator car motors, the combination of two casings, each including two chambers having alined bearings with their axes passing through both of said chambers, and a bear- 1 ing'having its axis at a right angle to the axis of said alined bearing-s; a shaft carried by'said alined bearings of each of said I casings; a wormrigid with each of said shafts disposed in one of said chambers of the respective casing it is associated with, the threads of both of said worms extending in the same direction; a rack for eachof said worms; two'bevel gears, one rigid with each of said shafts and disposed Within the other chamber of its respective casing, said bevel gears being also disposed with their toothed'portions facing in opposite directions with respect to each other; a countershaftcarr'ied by said bearings of said cas-j ings disposed at a'right angle to the bear- 5 ings: of said first-mentioned shafts, and, bevel gears carried by said counter-shaft and 1 co-meshing with said first-mentioned bevel gears to rotate said worms simultaneously in the same direction, substantially as and for the-purpose set forth,

2. In transmission mechanism for elevaof-said chambers, and a bearing having its axis at a right angle to the axis of said allned bearings; a shaft carried by said alined bearings of each of said casings; a

worm rigid with each of said shafts disposed in one of said chambers of the respective casing it is associated with; a rack for each of said worms; two bevel gears, one rigid with each of said shafts and disposed within the other chamber of its respective casing; a counter-shaft carried by the said bearings of the said casings disposed at a right angle to the bearings of said first-mentioned shafts; and, bevel gears carried by said counter-shaft and co-meshing with said first-mentioned bevel gears to rotate said worms, substantially as and for the purpose set forth.

3. In transmission mechanism for elevator car motors, the combination of two casings, each including two chambers having alined bearings with their axes passing through both of said chambers; a shaft carried by said alined bearings of each of said casings; a worm rigid with each of said shafts disposed in one of said chambers of the respective casing it is associated with, the threads of both of said wormsextending in the same-direction; a rack for each of said worms; two bevel gears, one rigid with each of said shafts and disposed within the other chamber of its respective casing, said bevel gears being also disposed with their toothed portions facing in opposite directions with respect to each other; second bevel gears comeshing with said first-mentioned bevel gears; and, means for rotating said secondmentioned bevel gears simultaneously in the same direction, to impart movement to said worms therethrough, substantially as and for the purpose set forth.

4. In transmission mechanism for elevator car motors, the combination of two casings, each including two chambers having alined bearings with their axes passing through both of said chambers, a vertical shaft carried by said alined bearings of each of said casings, a worm rigid with each of'said shafts disposed in one of said chambers of the respective casing it is associated with, the threads of both of said worms extending in the same direction, complementary racks disposed in parallelism, one for each of the said worms, two bevel gears, one rigid on each of said vertical shafts and disposed within the other chamber of its respective casing, said bevel gears being also disposed with their toothed portions facing in opposite directions with respect to each other, a bearing formed within one of the said casings, the axes of the bearing extending in a transverse direction to the axes said last mentioned shaft, substantially as of the vertical shaft, a fgaft journaled and for the purpose set forth.

within said bearing, second vel gears rigid with said last mentioned shaft and meshing ANDREW BJORKSTROM' with said first mentioned bevel gears to im- Witnesses:

part simultaneous movement to the said HARRY T. HAIRLA D,

Worms therethrough, and means for driving ANDERS G. HAHNE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0." 

